Greenheck Fan 470654 manual Set the Burner Air Pressure Differential, Set the Maximum Firing Rate

Page 16

Set the Burner Air Pressure Differential

With the fan running and discharging 70ºF (21ºC) air, connect a U-Tube manometer to the outer sensing probes (see below) and measure the static pressure across the burner.

Outer Sensing Probes

7

0.625 - 0.675 in. wc

6

U-Tube

Manometer

Measuring the Pressure Drop

important

Proper air velocity over the burner is critical on direct- fired gas units. If the air velocity is not within the unit specifications, the unit will not operate efficiently, may have sporadic shutdowns, and may produce excessive carbon monoxide (CO) or other gases.

The proper static pressure should be between 0.625 and 0.675 in. wg (155.68 and 168.64 Pa). If needed, evenly adjust the baffles on both sides of the burner, keeping the burner centered in the opening until the required pressure is obtained.

note

The pressure drop was set at the factory and may not need adjustment.

note

When required pressure is obtained, be sure to reconnect the outer sensing probes.

important

This process may need to be repeated until the proper pressure is achieved. This adjustment will change the air quantity delivered by the unit and therefore the air quantity delivered should be rechecked. Refer to the Blower Start-Up section.

note

To increase the static pressure decrease the opening. To decrease the static pressure increase the opening.

Set the Maximum Firing Rate

Monitor the unit’s actual temperature rise by placing a thermocouple in the unit’s inlet and a second in the discharge, three duct diameters downstream of the burner.

Send the unit to maximum fire by disconnecting and isolating the wire connected to Terminal 3 on the Maxitrol 14 or the Maxitrol 44. See images on page 18.

While monitoring the units temperature rise, set the maximum firing rate by adjusting the regulator until the designed temperature rise is achieved. After setting the maximum firing rate, reconnect the wire to the amplifier.

note

Do not set the burner maximum firing rate based on gas pressure. It should be set based on the unit’s designed temperature rise shown on the direct gas label.

 

 

Burner

Adjustable

 

Adjustable

Baffle

 

 

Baffle

 

 

 

 

Airflow

Airflow

Burner and Baffles

MIN GAS

PRESSURE“ WC PRESSION DE GAZ

MIN BURNER

PRESSURE DROP“ WC PERTE MIN DE PRESSION

DANS LE BRULEUR

TYPE OF GAS

NATURE DU GAZ

EQUIPPED FOR

AGAINST

 

SCFM

CONCU POUR

CONTE

MAX GAS

PRESSURE“ WC PRESSION DE GAZ

MAX

MAX BURNER

PRESSURE DROPPSI PERTE MAX DE PRESSION

DANS LE BRULEUR

DESIGN ∆T

F

∆T NORMALE

 

 

 

 

EXTERNAL STATIC PRESSURE

 

“ WC

 

PRESSION STATIQUE EXTERIEURE

16Model VSU Make-Up Air

Direct Gas Nameplate

Maximum firing rate adjustment

Combined Regulator Valve

®

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Contents Installation, Operation and Maintenance Manual Model VSU General Safety InformationInspection and Maintenance during Storage ReceivingUnpacking HandlingTable of Contents Product Overview SubassembliesBurner, Blower and Control Center Section Open ViewControl Center Burner SubassemblyDampers Installation Installation of Optional Service Platform Complete InstallationService Platform Material List Assembly Figure CInstallation of Electrical Wiring Install Additional Regulator if Required Installation of Direct Gas PipingDetermine the Supply Gas Requirements Installation of Building Pressure Control optional Unit Model Number Start-Up ChecklistCheck blower rotation Check for vibration Supply fan RPM Start-Up Blower Check the Optional High and Low Gas Pressure Switches Start-Up Direct GasSet-Up Optional Components Check the Supply Gas PressureMaximum firing rate adjustment Set the Burner Air Pressure DifferentialSet the Maximum Firing Rate Measuring the Pressure DropRegulators and Modulating Valves Set the Minimum Firing RateFlame Signal Check Pilot Ignition Set the Unit’s Operating TemperatureMaxitrol Series 44 9 Terminals The Maxitrol Variable Volume Operation Operation VAV Units optionalSpeed ModulatingOperation Recirculating Units optional Operation ElectricalRecirculation Operation Electrical Sequence Exhaust Fan Contact S1 Closed optionalFlame Safeguard FSG Sequence 3a. Heat Contact S4 Closed Pilot Ignition3b. Heat Contact S4 Closed Direct Spark Heat Contact ClosedTroubleshooting Blower Does Not OperateMotor Overamps Insufficient Airflow Too Much AirflowExcessive Noise or Vibration Heater Does Not Operate Pilot Ignition Does not attempt to light No visible sparkAttempts to light, but no pilot visible spark Visible pilot Between 0.625 and 0.675 in. WC?Heater Does Not Operate Direct Spark Attempts to light, but no flame Visible spark Maintenance Routine Belt DrivesMotors WheelsMaintenance Fall Reference Typical Gas Train Layout with Direct Spark Ignition Dirty Filter Switch Fan Relay allows power to pass to energize motor starterHeat Relay allows power to pass to heating controls Control Center LayoutWarranty Maintenance LogDateTime AM/PM

470654 specifications

Greenheck Fan 470654 is a cutting-edge ventilation solution designed to meet the demanding requirements of commercial and industrial applications. Renowned for its reliability and efficiency, this fan model integrates advanced technologies and engineering to provide optimal air movement and control.

One of the standout features of the Greenheck Fan 470654 is its robust construction. Designed with high-quality materials, the fan promotes longevity and durability, making it suitable for use in tough environments. This fan features a heavy-gauge steel housing that minimizes vibration and enhances noise reduction, contributing to a quieter operation, a critical factor in maintaining a serene working environment.

The fan is equipped with a powerful motor that ensures efficient airflow, achieving high performance while consuming minimal energy. This energy efficiency is emphasized through the use of advanced motor technology, including variable frequency drive (VFD) compatibility. VFDs allow for precise control of the fan speed, enabling adjustments based on system demand, thus significantly reducing energy consumption and operating costs.

In terms of airflow performance, the Greenheck Fan 470654 is engineered to provide a high volume of air movement while maintaining static pressure. Its aerodynamic design minimizes resistance, enhancing overall efficiency. The fan is designed to operate across a range of static pressures, making it versatile for different applications, from commercial kitchens to large manufacturing facilities.

Additionally, the fan's installation is straightforward, thanks to its user-centric design. The model incorporates mounting brackets and options for various duct configurations, ensuring seamless integration into existing systems. Maintenance is also made easier with accessible components, allowing technicians to perform regular checks and upkeep without extensive downtime.

Safety features are a priority in the design of the Greenheck Fan 470654. It includes protective features such as thermal overload protection to prevent motor damage and extend operational life. The fan's design also adheres to industry standards and regulations, providing peace of mind for users.

In summary, the Greenheck Fan 470654 is a well-engineered solution that combines durability, efficiency, and advanced technology to deliver superior performance in ventilation applications. With its powerful motor, energy-saving capabilities, and ease of installation and maintenance, it stands out as a reliable choice for professionals seeking optimal airflow management.
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